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Slide 2

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The formation of wavesWind blowing over the seas surface causes small ripples which grow intowaves. Waves are responsible for most of coastal erosion. When a waveapproaches the coast its lower part is slowed by friction with the sea bed,whereas the upper part continues to move forward ­ the terms "breakingwaves" is used. As it is left unsupported it topples over and breaks forwardagainst the cliff face or up the beach. There are two types of waves:· Destructive waves- waves which erode most· Constructive waves (addressed later on in powerpoint when looking at Longshore drift and deposition)…read more

Slide 3

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Destructive wavesThese waves have three main features:-They are high in proportion to their length.-The backwash is much stronger than the wash therefore rocks, pebbles andsand are pulled back into the sea.-They are more frequent than constructive waves breaking at an average ofbetween eleven and fifteen per minute.The height and destructiveness of these waves depends on the distanceover which these waves have travelled and the wind speed or fetch. If thewaves have travelled over a long distance they have had time to build uptherefore a lot of energy is released when they reach the coast.Fetch- is the length of water of which the wind has blown. The greater thefetch and the stronger the wind, the more powerful the wave andessentially the more destructive.…read more

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Slide 5

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Processes of coastal erosion·Hydraulic Power·Corrasion·Attrition·Corrosion…read more

Slide 6

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Hydraulic pressure/actionThe weight and impact of the water against the coastline.Much greater under storm conditions when hundred of tonnesof water may hit the cliff face. Air trapped in cracks and caves iscompressed by the waves increasing the pressure on the rock.…read more